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Subject[PATCH] gpio: pca953x: Clear irq trigger type on irq shutdown
Date
The driver stores the result of irq_set_type() in the internal variables
irq_trig_raise and irq_trig_fall, which later are used to determine
the GPIOs that must be re-configured as input. These variables retain their
value between gpiolib's export / unexport, resulting in an incorrect
state in some cases. The corresponding bits in the variables
irq_trig_raise and irq_trig_fall should be cleared in irq_shutdown().

Signed-off-by: Denis Grigoryev <grigoryev@fastwel.ru>
---
drivers/gpio/gpio-pca953x.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index d2ead4b..b41be8c 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -522,6 +522,15 @@ static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
return 0;
}

+static void pca953x_irq_shutdown(struct irq_data *d)
+{
+ struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
+ u8 mask = 1 << (d->hwirq % BANK_SZ);
+
+ chip->irq_trig_raise[d->hwirq / BANK_SZ] &= ~mask;
+ chip->irq_trig_fall[d->hwirq / BANK_SZ] &= ~mask;
+}
+
static struct irq_chip pca953x_irq_chip = {
.name = "pca953x",
.irq_mask = pca953x_irq_mask,
@@ -529,6 +538,7 @@ static struct irq_chip pca953x_irq_chip = {
.irq_bus_lock = pca953x_irq_bus_lock,
.irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock,
.irq_set_type = pca953x_irq_set_type,
+ .irq_shutdown = pca953x_irq_shutdown,
};

static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
--
2.7.4
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